Here’s what Bears coaches, players have said about Justin Fields ahead of first NFL start

"Just trust your instincts," Nagy said. "Play the way you've played your entire career. And play loose. Have fun, too. Go out there and trust your teammates. Don't try to be a hero. Just go out there and play. Be a great quarterback for this game and see where it takes you the rest of the year."

"Well, with Justin there's a play that's called and then there's the second play that turns into kind of some backyard football," Kmet said. "You've just got to be aware of that. "The scramble drill is really alive now with Justin and he's going to keep his eyes downfield for those throws."

“He’s very confident,” Peters said, “so when he calls a play you just want to make sure you do your job because you definitely believe in the kid that he’s going to make a play for you. And most of the time he does.”

"He makes plays in practice," Goodwin said. "I mean, he goes against our No. 1 defense every day and you see what they did on Sunday. "I've seen him make plays in practice. I know he's definitely prone to make some throughout this week's game."

"Just him coming in and being so poised, he wasn't, like, flustered or anything," Edwards said. "He was put in some difficult situations and he was a pro about it, and he came out with the W."

“He’s always calm,” Mooney said. “He just wants to make a play and get a dub [a win] for the team. It’s been showing on the field. It’s been showing off the field as well in practice. And with him getting a lot of reps this week, it’s showing as well.”

“I think it’s his poise — that’s something that really stands out,” Kmet said. “Last weekend [against the Bengals] he throws that pick [and] it’s just next play — which is really impressive. So we’ve seen that. He has an ultimate confidence in himself, which is really cool to see. When the quarterback has confidence like that, it instills confidence in everybody else.”

“If he’s running, you better run deep because he wants to throw the ball deep,” Mooney said.

“There’s nothing wrong with being excited and showing positive emotion with your team — but no one wants to see knees shaking,” offensive coordinator Bill Lazor said. “It’s one of those things where when it’s not a problem, you’re good and you can move forward. When it’s a problem, it’s a problem — and it hasn’t been a problem with Justin.

“Guys who are way up and down emotionally, they can tip over the edge sometimes and make some bigger errors,” he said. “I think guys like Justin, who so far have shown to be flat-liners and controlled their emotions and steady, in the long haul are gonna be more successful.”

“Both of them throw the ball differently,” Mooney said. “Justin likes to lay it over the top of you a little bit; Andy likes to put it on you sometimes. It’s just understanding who’s in and the chemistry we have with the quarterbacks.”

"Justin Fields is good. He's great," Montgomery said. "He comes in with a winning mentality. He's so composed and calm. He's taking every rep like it's a game rep. Justin is a dangerous weapon with his arm and with his legs."

"It's unfortunate what happened to Andy because Andy was really playing well there at the beginning part of that game," Nagy said. "Andy is a very tough player and a team guy and I know he's been very supportive here moving forward with Justin. But there is excitement. Justin prepares well. This is going to be his first time to truly prepare as the starter and see what it's like every single day to do that stuff mentally and physically in practice.

"The other thing is this is obviously big news to a lot of people and to him. I think the biggest thing we can help him with [concerning] the distraction part is making sure you take care of what you need to take care of, keep him insulated, and that's what we'll do, and then go out and learn and have fun. When you're playing, go have fun, be a great teammate, and that's probably one of Justin's greatest strengths."

“He’s having fun. At the end of the day, if you’re not having fun, then why are you doing it?” Goodwin said. “So I love to see that, especially out of a young player, because some guys come in and they’re … tight and just don’t want to make the wrong move. But he’s confident and he plays with confidence.”

"He's ready," Jackson said.